package Collection;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Random;

/**
 * Collections.sort():用于对集合排序
 * 对整数集合排序
 */
public class SortInteger {
    public static void main(String[] args) {
        Random rand =new Random();
        List<Integer> list =new ArrayList<>();
        for (int i =0;i<10;i++){
            list.add(rand.nextInt(100));
        }
        System.out.println("list原始数据:"+list);//无序

        Collections.sort(list);//自然排序(从小到大)
        System.out.println("list排序后数据:"+list);//(从小到大)

        Collections.reverse(list);//反转list集合
        System.out.println("list反转后数据:"+list);//(大到小)
    }
}
